Onyomi/Kunyomi Errors

I’ve had this happen a few times as well (鏡 gave me trouble with this just the other day). Its a little frustrating when you already know the onyomi but WK doesn’t teach it and thus only accepts the kunyomi as the kanji’s reading.

but kanji like that are few and far between, and no more than 1 in every other level (in my experience).

If it helps, kunyomi is usually used if the vocab is made up of a stand-alone kanji or a single kanji followed by hiragana
Onyomi is usually used for vocab made up of multiple kanji, but there are loads of exceptions (and the mnemonics will mention that)

you can download the ignore script to give yourself a second chance!